WO2009061317A1 - Optical code scanner with automatic focusing - Google Patents
Optical code scanner with automatic focusing Download PDFInfo
- Publication number
- WO2009061317A1 WO2009061317A1 PCT/US2007/084043 US2007084043W WO2009061317A1 WO 2009061317 A1 WO2009061317 A1 WO 2009061317A1 US 2007084043 W US2007084043 W US 2007084043W WO 2009061317 A1 WO2009061317 A1 WO 2009061317A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- scanner
- illumination
- optical code
- code
- distance
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10792—Special measures in relation to the object to be scanned
- G06K7/10801—Multidistance reading
- G06K7/10811—Focalisation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/12—Fluid-filled or evacuated lenses
- G02B3/14—Fluid-filled or evacuated lenses of variable focal length
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10712—Fixed beam scanning
- G06K7/10722—Photodetector array or CCD scanning
- G06K7/10732—Light sources
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K2207/00—Other aspects
- G06K2207/1013—Multi-focal
Definitions
- the present convention relates generally to autofocus scanning systems and, more particularly, concerns code scanners capable of reading effectively over a wide range distances from a near field to a far field.
- Barcode scanners are a common form of code scanner. Some scanners of this type are handheld and need to recognize codes on labels in a large range of sizes over a large range of distances. For example, a barcode reader should, ideally, to be able to read anything from a tiny label with a resolution of 0.127 mm at a distance of 50 mm (near field) to a huge label with a resolution of 1.4 mm at a distance of 3 m (far field). Some scanners need to recognize two-dimensional codes, which presents an even more stringent requirement.
- the fundamental problem is that the scanning system must retain sharp focus over a large depth of field (DOF), the distance, included in the near to far fields.
- DOF depth of field
- the effective DOF can be increased by a using an automatic focus or zoom focus mechanism, such as one having a voice coil motor, to operate the optics or, the like.
- they tend to have a relatively slow response (I do not think that this is true.), involve the use of moving parts (reliability issue) (If so all digital cameras and mobile phones have the same issues.), and have a relatively limited focal range (I do not think that this is true.). They are also not easily retrofitted into existing systems, since they must be introduced in the middle of the optics, requiring redesign of all the lenses.
- an object of the present invention to provide an optical code scanner which is capable of detecting a code image effectively over all distances from a near field to a far field. It is another object of the present invention to provide an optical code scanner which is capable of detecting a code image a relatively quickly, preferably in 20 ms, or less.
- a code scanner which illuminates a scanned code from a distance, includes a liquid lens which focuses the reflected image of the code on an image sensor.
- the scanner includes a range detector, preferably laser- based, which determines the distance to the scanned code, and the liquid lens is controlled to focus at the detected distance.
- a code scanner which illuminates a scanned code from a distance includes a range detector, preferably laser-based, which determines the distance to the scanned code, and the source of illumination is uncontrolled to maintain its intensity substantially constant, regardless of the distance of the scanned code. This can be achieved by controlling the intensity of illumination (directly), or the dispersal angle of illumination in relationship to the distance.
- FIG. 1 is schematic diagram illustrating a code scanner 10 embodying the present invention.
- the scanner 10 has a light source 12, which illuminates an optical code 14, such as a barcode, at a distance.
- the light L reflected from barcode 14 forms an image on image sensor 16, which is processed to decode the bar code 14.
- a liquid lens 18 is interposed in the light path L between bar code 14 and image sensor 16.
- this an electro optical type of device which has a optical interface between two transparent layers. Through the adjustment of an applied voltage, the shape of that interface maybe changed, changing the focal length of the lens.
- the distance between the lens 18 and image sensor 16 remains fixed, however, the distance to the left of lens 18 of the plain on which the lens will focus will vary with the applied voltage.
- a ranging apparatus which preferably comprises a laser device and a laser detector 24.
- Pulsing technology measures the delay time between the initiation of a laser pulse and the return of its reflection.
- Parallax technology projects a light beam to form a spot on a target and then measures the position of the detected spot on the target. The distance of the target can be determined from the position of the detected spot.
- laser device 22 and detector 24 define a parallax ranging subsystem.
- Laser 22 projects a light beam onto bar code 14 and detector 24 senses the position of the resulting dot and determines the distances of bar code 14. It then produces a signal representative of that distance, which is applied to controller 20. In response, controller 20 is then able to apply a voltage to lens 18 to focus it appropriately.
- the output signal of detector 24 is also applied to light source 12, the intensity of which is controlled accordingly.
- source 12 could be a ray of light emitting diodes, and the intensity could be controlled by the numbers of diodes on the array that are turned on (more simply by changing optical output power).
- the intensity of light source 12 could also be controlled by varying the dispersion angle of the light at the midst.
- Those skilled in the art will appreciate that that could be achieved mechanically by controlling the angle of vain- like devices or the like, or it can be achieved optically with a condensing lens. It would be possible to provide a plurality of condensing lens and select among them or to provide a zooming lens, possibly even a liquid lens.
- liquid lens 18 is ARCTIC-414 or ARCTIC-416 produced by Varioptic.
- liquid lenses may be utilized as well.
- the laser is mounted atop of the camera module, instead of at the sides or on the bottom. Additionally, the laser should be offset from the optical axis by an amount equal to 6-15 mm. Moreover, if a LEDs are used for illumination, they should be mounted on the opposite of the module from the laser, in order to minimize the effects of reflection.
- the present invention exhibits advantages over the prior art in that it is capable of focusing a code image more quickly; in that it avoids the use of moving parts, eliminating the associated reliability issues; in that it has a substantially greater focus range; and in that it is easily retrofitted into existing scanning systems
Abstract
A code scanner, which illuminates a scanned code from a distance, includes a liquid lens which focuses the reflected image of the code on an image sensor. The scanner includes a range detector, preferably laser-based, which determines the distance to the scanned code, and the liquid lens is controlled to focus at the detected distance. A source of illumination is uncontrolled to maintain its intensity substantially constant, regardless of the distance of the scanned code. This can be achieved by controlling the intensity of illumination (directly), or the dispersal angle of illumination in relationship to the distance.
Description
OPTICAL CODE SCANNER WITH AUTOMATIC FOCUSING
BACKGROUND ART
The present convention relates generally to autofocus scanning systems and, more particularly, concerns code scanners capable of reading effectively over a wide range distances from a near field to a far field.
Optical scanning systems find wide application throughout industry. Barcode scanners are a common form of code scanner. Some scanners of this type are handheld and need to recognize codes on labels in a large range of sizes over a large range of distances. For example, a barcode reader should, ideally, to be able to read anything from a tiny label with a resolution of 0.127 mm at a distance of 50 mm (near field) to a huge label with a resolution of 1.4 mm at a distance of 3 m (far field). Some scanners need to recognize two-dimensional codes, which presents an even more stringent requirement.
The fundamental problem is that the scanning system must retain sharp focus over a large depth of field (DOF), the distance, included in the near to far fields. The effective DOF can be increased by a using an automatic focus or zoom focus mechanism, such as one having a voice coil motor, to operate the optics or, the like. However, they tend to have a relatively slow response (I do not think that this is true.), involve the use of moving parts (reliability issue) (If so all digital cameras and mobile phones have the same issues.), and have a relatively limited focal range (I do not think that this is true.). They are also not easily retrofitted into existing systems, since they must be introduced in the middle of the optics, requiring redesign of all the lenses.
Even if the shortcomings of autofocus mechanisms could be overcome, the achievement of an ideal DOF could not be achieved. Illumination for reading the code is provided by the scanner, and it falls off steeply with distance. Thus, an illumination which is barely sufficient in the far field would be much too bright in the near field.
Broadly, it is an object of the present invention to provide an optical code scanner which is capable of detecting a code image effectively over all distances from a near field to a far field. It is another object of the present invention to provide an optical code scanner which is capable of detecting a code image a relatively quickly, preferably in 20 ms, or less.
It is another object of the present invention to provide an optical code scanner which avoids the use of moving parts, eliminating the associated reliability issues.
It is another object of the present invention to provide an optical code scanner which has a substantially greater focus range than available optical code scanners.
It is another object of the present invention to provide an optical code scanner which is easily retrofitted into existing scanning systems.
It is also an object of the present invention to provide an optical code scanner which is convenient and reliable in use, yet relatively simple and inexpensive in construction.
DISCLOSURE OF INVENTION
In accordance with one aspect of the present invention, a code scanner, which illuminates a scanned code from a distance, includes a liquid lens which focuses the reflected image of the code on an image sensor. The scanner includes a range detector, preferably laser- based, which determines the distance to the scanned code, and the liquid lens is controlled to focus at the detected distance.
In accordance with another aspect of the invention, a code scanner, which illuminates a scanned code from a distance includes a range detector, preferably laser-based, which determines the distance to the scanned code, and the source of illumination is uncontrolled to maintain its intensity substantially constant, regardless of the distance of the scanned code. This can be achieved by controlling the intensity of illumination (directly), or the dispersal angle of illumination in relationship to the distance.
BRIEF DESCRIPTION OF DRAWINGS The foregoing brief description, and other objects, features and advantages of the present invention will be understood more completely from the following detailed description of presently preferred, but nonetheless illustrative, embodiments in accordance with the present invention, with reference being had to the accompanying drawings, in which Figure 1 is schematic diagram illustrating a code scanner embodying the present invention.
BEST MODE OF CARRYING OUT THE INVENTION
Turning now to the details of the drawings, Figure 1 is schematic diagram illustrating a code scanner 10 embodying the present invention. The scanner 10 has a light source 12, which illuminates an optical code 14, such as a barcode, at a distance. The light L reflected from barcode 14 forms an image on image sensor 16, which is processed to decode the bar code 14. A liquid lens 18 is interposed in the light path L between bar code 14 and image sensor 16. Those skilled in the art will understand that this an electro optical type of device which has a optical interface between two transparent layers. Through the adjustment of an applied voltage, the shape of that interface maybe changed, changing the focal length of the lens. The distance between the lens 18 and image sensor 16 remains fixed, however, the distance to the
left of lens 18 of the plain on which the lens will focus will vary with the applied voltage. It is therefore possible to focus barcodes 14 at a range of distances from image sensors 16 by simply varying a voltage that controller 20 applies to lens 18. Mechanical movement of the lens is not necessary. However, it will be appreciated that the control voltage applied to lens 18 must be correlated to the actual distance of barcode 14 from lens 18 and, therefore, from image sensor 16.
In order to ensure appropriate control of lens 18, a ranging apparatus is provided which preferably comprises a laser device and a laser detector 24. Two types of laser ranging technology are well known in the art. Pulsing technology measures the delay time between the initiation of a laser pulse and the return of its reflection. Parallax technology projects a light beam to form a spot on a target and then measures the position of the detected spot on the target. The distance of the target can be determined from the position of the detected spot. Preferably, laser device 22 and detector 24 define a parallax ranging subsystem. Laser 22 projects a light beam onto bar code 14 and detector 24 senses the position of the resulting dot and determines the distances of bar code 14. It then produces a signal representative of that distance, which is applied to controller 20. In response, controller 20 is then able to apply a voltage to lens 18 to focus it appropriately.
The output signal of detector 24 is also applied to light source 12, the intensity of which is controlled accordingly. In its simplest form, source 12 could be a ray of light emitting diodes, and the intensity could be controlled by the numbers of diodes on the array that are turned on (more simply by changing optical output power). The intensity of light source 12 could also be controlled by varying the dispersion angle of the light at the midst. Those skilled in the art will appreciate that that could be achieved mechanically by controlling the angle of vain- like devices or the like, or it can be achieved optically with a condensing lens. It would be possible to provide a plurality of condensing lens and select among them or to provide a zooming lens, possibly even a liquid lens.
In any event, through the controller focus distance and light source illumination in relationship to the distance of the bar code, it becomes possible to achieve DOF performance which approaches the ideal. Preferably, liquid lens 18 is ARCTIC-414 or ARCTIC-416 produced by Varioptic.
However, other liquid lenses may be utilized as well.
In a preferred arrangement, the laser is mounted atop of the camera module, instead of at the sides or on the bottom. Additionally, the laser should be offset from the optical axis by an amount equal to 6-15 mm. Moreover, if a LEDs are used for illumination, they should be
mounted on the opposite of the module from the laser, in order to minimize the effects of reflection.
As indicated previously the present invention exhibits advantages over the prior art in that it is capable of focusing a code image more quickly; in that it avoids the use of moving parts, eliminating the associated reliability issues; in that it has a substantially greater focus range; and in that it is easily retrofitted into existing scanning systems
Although a preferred embodiment of the invention has been disclosed for a illustrative purposes, those skilled in the art will appreciate that many additions, modifications, and substitutions are possible without departing from the scope and spirit of the invention as defined by the accompanying claims.
Claims
1. A scanner for imaging a remote optical code comprising: an image sensor receiving an image of the code made up of light reflected therefrom; a liquid lens interposed between the code and the image sensor creating the image on the sensor and having a control input for a signal which controls focus of the lens; a range detector producing a range signal related to the distance of the optical code, a signal being applied to the control input of the lens which is related to the range signal.
2. The scanner of claim 1 wherein the range detector comprises a laser radiator projecting a beam onto the optical code to create a spot thereon and a laser detector sensing a reflection from the spot and determining the distance of the optical code.
3. The scanner of claim 2, wherein the sensor responds to the sensed position of the spot.
4. The scanner of claim 1 further comprising a source of illumination directed towards the optical code and a controller constructed to control the illumination in relationship to the range signal.
5. The scanner of claim 4 wherein the controller is constructed to control the intensity of illumination in relationship to the range signal.
6. The scanner of claim 4 wherein the controller is constructed to control the angle of disbursement of illumination in relationship to the range signal.
7. The scanner of claim 4 wherein the range detector comprises a laser radiator projecting a beam onto the optical code to create a spot thereon and a laser detector sensing a reflection from the spot and determining the distance of the optical code.
8. The scanner of claim 7, wherein the sensor responds to the sensed position of the spot.
9. A scanner for imaging a remote optical code comprising: an image sensor receiving an image of the code made up of light reflected therefrom; optics interposed between the code and the image sensor creating the image on the sensor; a range detector producing a range signal related to the distance of the optical code; a source of illumination directed towards the optical code; and a controller constructed to control the illumination in relationship to the range signal.
10. The scanner of claim 9 wherein the range detector comprises a laser radiator projecting a beam onto the optical code to create a spot thereon and a laser detector sensing a reflection from the spot and determining the distance of the optical code.
11. The scanner of claim 10, wherein the sensor responds to the sensed position of the spot.
12. The scanner of claim 10 wherein the controller is constructed to control the intensity of illumination in relationship to the range signal.
13. The scanner of claim 10 wherein the controller is constructed to control the angle of disbursement of illumination in relationship to the range signal.
14. The scanner of claim 9 wherein the controller is constructed to control the intensity of illumination in relationship to the range signal.
15. The scanner of claim 9 wherein the controller is constructed to control the angle of disbursement of illumination in relationship to the range signal.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07844971A EP2218033A4 (en) | 2007-11-08 | 2007-11-08 | Optical code scanner with automatic focusing |
CN200780101467A CN101855639A (en) | 2007-11-08 | 2007-11-08 | Optical code scanner with automatic focusing |
PCT/US2007/084043 WO2009061317A1 (en) | 2007-11-08 | 2007-11-08 | Optical code scanner with automatic focusing |
JP2010533055A JP2011504247A (en) | 2007-11-08 | 2007-11-08 | Optical code scanner with autofocus |
US12/749,958 US20100294839A1 (en) | 2007-11-08 | 2010-03-30 | Optical code scanner with automatic focusing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2007/084043 WO2009061317A1 (en) | 2007-11-08 | 2007-11-08 | Optical code scanner with automatic focusing |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/749,958 Continuation US20100294839A1 (en) | 2007-11-08 | 2010-03-30 | Optical code scanner with automatic focusing |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2009061317A1 true WO2009061317A1 (en) | 2009-05-14 |
Family
ID=40626033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/084043 WO2009061317A1 (en) | 2007-11-08 | 2007-11-08 | Optical code scanner with automatic focusing |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2218033A4 (en) |
JP (1) | JP2011504247A (en) |
CN (1) | CN101855639A (en) |
WO (1) | WO2009061317A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011146095A1 (en) * | 2010-05-17 | 2011-11-24 | Symbol Technologies, Inc. | Focus adjustment with liquid crystal device in imaging scanner |
JP2012068784A (en) * | 2010-09-22 | 2012-04-05 | Casio Comput Co Ltd | Two-dimensional pattern reading apparatus, control method thereof and program |
JP2016201116A (en) * | 2016-06-22 | 2016-12-01 | カシオ計算機株式会社 | Light irradiation device and program |
WO2017164949A1 (en) * | 2016-03-22 | 2017-09-28 | Symbol Technologies, Llc | Imaging module and reader for, and method of, variably illuminating targets to be read by image capture over a range of working distances |
US11595741B2 (en) | 2020-04-09 | 2023-02-28 | Sick Ag | Camera and method for detecting image data |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013025507A (en) * | 2011-07-19 | 2013-02-04 | Nippon Telegr & Teleph Corp <Ntt> | Printed information reading device |
US8576390B1 (en) * | 2012-07-31 | 2013-11-05 | Cognex Corporation | System and method for determining and controlling focal distance in a vision system camera |
US8873892B2 (en) * | 2012-08-21 | 2014-10-28 | Cognex Corporation | Trainable handheld optical character recognition systems and methods |
TWI505198B (en) * | 2012-09-11 | 2015-10-21 | Sintai Optical Shenzhen Co Ltd | Bar code reading method and reading device |
CH712734A1 (en) * | 2016-07-22 | 2018-01-31 | Tecan Trading Ag | Recognition device and method for detecting labels and / or features of laboratory objects. |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5495096A (en) * | 1991-09-20 | 1996-02-27 | Omron Corporation | Multi-focus optical device |
US6505778B1 (en) * | 1998-07-17 | 2003-01-14 | Psc Scanning, Inc. | Optical reader with selectable processing characteristics for reading data in multiple formats |
US20070156021A1 (en) * | 2005-09-14 | 2007-07-05 | Bradford Morse | Remote imaging apparatus having an adaptive lens |
US7246747B2 (en) * | 2000-02-28 | 2007-07-24 | Datalogic Scanning, Inc. | Multi-format bar code reader |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5864128A (en) * | 1991-10-15 | 1999-01-26 | Geo Labs, Inc. | Lens with variable focal length |
US7296749B2 (en) * | 2004-01-23 | 2007-11-20 | Intermec Ip Corp. | Autofocus barcode scanner and the like employing micro-fluidic lens |
JP2006201639A (en) * | 2005-01-24 | 2006-08-03 | Citizen Electronics Co Ltd | Zoom unit for camera and camera |
US20070063048A1 (en) * | 2005-09-14 | 2007-03-22 | Havens William H | Data reader apparatus having an adaptive lens |
EP1804100B1 (en) * | 2005-12-30 | 2018-02-21 | Datalogic IP TECH S.r.l. | Device and method for focusing a laser light beam |
CN101001304A (en) * | 2006-01-09 | 2007-07-18 | 明基电通信息技术有限公司 | Image scanning device and its focus method |
DE202006017268U1 (en) * | 2006-11-11 | 2008-03-27 | Leuze Electronic Gmbh & Co Kg | barcode scanner |
US20090072037A1 (en) * | 2007-09-17 | 2009-03-19 | Metrologic Instruments, Inc. | Autofocus liquid lens scanner |
-
2007
- 2007-11-08 WO PCT/US2007/084043 patent/WO2009061317A1/en active Application Filing
- 2007-11-08 CN CN200780101467A patent/CN101855639A/en active Pending
- 2007-11-08 EP EP07844971A patent/EP2218033A4/en not_active Withdrawn
- 2007-11-08 JP JP2010533055A patent/JP2011504247A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5495096A (en) * | 1991-09-20 | 1996-02-27 | Omron Corporation | Multi-focus optical device |
US6505778B1 (en) * | 1998-07-17 | 2003-01-14 | Psc Scanning, Inc. | Optical reader with selectable processing characteristics for reading data in multiple formats |
US7246747B2 (en) * | 2000-02-28 | 2007-07-24 | Datalogic Scanning, Inc. | Multi-format bar code reader |
US20070156021A1 (en) * | 2005-09-14 | 2007-07-05 | Bradford Morse | Remote imaging apparatus having an adaptive lens |
Non-Patent Citations (1)
Title |
---|
See also references of EP2218033A4 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011146095A1 (en) * | 2010-05-17 | 2011-11-24 | Symbol Technologies, Inc. | Focus adjustment with liquid crystal device in imaging scanner |
US8348168B2 (en) | 2010-05-17 | 2013-01-08 | Symbol Technologies, Inc. | Focus adjustment with liquid crystal device in imaging scanner |
CN103098073A (en) * | 2010-05-17 | 2013-05-08 | 讯宝科技公司 | Focus adjustment with liquid crystal device in imaging scanner |
JP2012068784A (en) * | 2010-09-22 | 2012-04-05 | Casio Comput Co Ltd | Two-dimensional pattern reading apparatus, control method thereof and program |
WO2017164949A1 (en) * | 2016-03-22 | 2017-09-28 | Symbol Technologies, Llc | Imaging module and reader for, and method of, variably illuminating targets to be read by image capture over a range of working distances |
US10491790B2 (en) | 2016-03-22 | 2019-11-26 | Symbol Technologies, Llc | Imaging module and reader for, and method of, variably illuminating targets to be read by image capture over a range of working distances |
JP2016201116A (en) * | 2016-06-22 | 2016-12-01 | カシオ計算機株式会社 | Light irradiation device and program |
US11595741B2 (en) | 2020-04-09 | 2023-02-28 | Sick Ag | Camera and method for detecting image data |
Also Published As
Publication number | Publication date |
---|---|
EP2218033A1 (en) | 2010-08-18 |
JP2011504247A (en) | 2011-02-03 |
CN101855639A (en) | 2010-10-06 |
EP2218033A4 (en) | 2010-12-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2009061317A1 (en) | Optical code scanner with automatic focusing | |
US20110200314A1 (en) | Liquid lens with temperature compensated focus time | |
US10635922B2 (en) | Terminals and methods for dimensioning objects | |
US5198648A (en) | Code sensor with multi-faceted reflector for sensing plural image distances | |
US7726573B2 (en) | Compact autofocus bar code reader with moving mirror | |
US6689998B1 (en) | Apparatus for optical distancing autofocus and imaging and method of using the same | |
JP2011530722A5 (en) | ||
US20110290886A1 (en) | Imaging bar code reader having variable aperture | |
US20080245872A1 (en) | Barcode scanner/reader having constantly varying focal distance | |
US20100294839A1 (en) | Optical code scanner with automatic focusing | |
WO2010143662A1 (en) | Optical information reading device | |
US10534944B1 (en) | Method and apparatus for decoding multiple symbology types | |
US9703115B2 (en) | Optoelectronic apparatus and method of taking an image | |
US20180004996A1 (en) | Optical code reader | |
US20190171855A1 (en) | Compact camera module with multilevel zoom and focus distance utilizing a switchable mirror | |
EP2572315B1 (en) | Focus adjustment with liquid crystal device in imaging scanner | |
JP2012508927A5 (en) | ||
US8028919B2 (en) | Imaging bar code reader with single prism focus adjustment | |
JP2006518861A (en) | Compact automatic focusing piezoelectric actuator system | |
JP5637844B2 (en) | Liquid crystal lens optical body and optical information reader | |
CN114818757A (en) | Arrangement and method for determining a target distance and adjusting a reading parameter of an imaging reader based on the target distance | |
WO2010104510A1 (en) | Variable focus optical system | |
NL2033269B1 (en) | Miniature long range imaging engine with auto-focus, auto-zoom, and auto-illumination system | |
JP4915300B2 (en) | Optical information reader | |
JP2022187471A (en) | Camera and method for detecting object moved through detection zone |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200780101467.3 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 07844971 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2010533055 Country of ref document: JP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2007844971 Country of ref document: EP |